FILE - In this Dec. 13, 2016 file photo, scientists hold signs during a rally in conjunction with the American Geophysical Union's fall meeting in San Francisco. The rally was to call attention to what scientist believe is unwarranted attacks by the incoming Trump administration against scientists advocating for the issue of climate change and its impact. Vowing to keep the United States on track to meet its emissions-cutting target even without the U.S. government's support, more than a dozen governors representing nearly 40 percent of the U.S. economy by Tuesday, June 6, 2017, had pledged themselves to stay in the climate-change fight despite the Trump administration's withdrawal from the Paris climate accords last week. (AP Photo/Marcio Jose Sanchez, File)
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